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https://issues.apache.org/jira/browse/HDFS-11069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16147611#comment-16147611
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Erik Krogen commented on HDFS-11069:
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Ah, thank you for the context, Kihwal. I am too new for that :)
> Tighten the authorization of datanode RPC
> -----------------------------------------
>
> Key: HDFS-11069
> URL: https://issues.apache.org/jira/browse/HDFS-11069
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode, security
> Reporter: Kihwal Lee
> Assignee: Kihwal Lee
> Fix For: 2.8.0, 2.9.0, 2.7.4, 3.0.0-alpha2
>
> Attachments: HDFS-11069.patch
>
>
> The current implementation of {{checkSuperuserPrivilege()}} allows the
> datanode user from any node to be recognized as a super user. If one
> datanode is compromised, the intruder can issue {{shutdownDatanode()}},
> {{evictWriters()}}, {{triggerBlockReport()}}, etc. against all other
> datanodes. Although this does not expose stored data, it can cause service
> disruptions.
> This needs to be tightened to allow only the local datanode user.
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